Q7 of 50 Page 1

Account for the following:

The electron gain enthalpy with negative sign for fluorine is less than that of chlorine, still fluorine is a stronger oxidizing agent than chlorine.

The oxidizing nature of an element depends on the following factors:

1. Bond Dissociation Enthalpy


2. Hydration Energy


3. Electron Gain Enthalpy


Though the electron gain enthalpy of fluorine is less as compared to that of chlorine, still fluorine is strong oxidizing agent as compared to chlorine because of following reasons:


1. The bond dissociation enthalpy of fluorine is low as compared to that of chlorine. In the small sized fluorine molecule, the repulsion between the electrons is very high as they are very close to each other and thus increasing lowering the value of bond dissociation enthalpy.


2. Due to low bond dissociation enthalpy and small size of fluorine, the value of hydration energy of fluorine is very high as compared to that of chlorine and hence the fluorine is a strong oxidizing agent as compared to chlorine.


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